/usr/include/log4cplus/helpers/ is in liblog4cplus-dev 1.1.2-3.1.
This file is owned by root:root, with mode 0o755.
..
/usr/include/log4cplus/helpers/appenderattachableimpl.h
/usr/include/log4cplus/helpers/fileinfo.h
/usr/include/log4cplus/helpers/lockfile.h
/usr/include/log4cplus/helpers/loglog.h
/usr/include/log4cplus/helpers/logloguser.h
/usr/include/log4cplus/helpers/pointer.h
/usr/include/log4cplus/helpers/property.h
/usr/include/log4cplus/helpers/queue.h
/usr/include/log4cplus/helpers/sleep.h
/usr/include/log4cplus/helpers/snprintf.h
/usr/include/log4cplus/helpers/socket.h
/usr/include/log4cplus/helpers/socketbuffer.h
/usr/include/log4cplus/helpers/stringhelper.h
/usr/include/log4cplus/helpers/thread-config.h
/usr/include/log4cplus/helpers/timehelper.h